Move raw data assets to dbt seeds

[jeancochrane]

One major pain point of this repo is that it maintains source-of-truth information in data-raw/ about variables that we otherwise primarily manage in https://github.com/ccao-data/data-architecture/. Let's update this package to move the raw data files to live as dbt seeds in data-architecture, and update the data-raw/ scripts that create RData files from the source data to read them from data-architecture. Note that the ccao_ids.R script already does this.

As a nice-to-have, it also might be nice to combine all of the RData generation scripts into one script to give us the option of updating everything in one function call.